Plate glass polishing apparatus



Nov. 15, 1932. H. K. Hl-TCHCQCK PLATE GLASS POLISHING APPARATUS 5 Sheets-Sheet 1 Filed Feb. 11, 1930 E i 1 O HHw Nov. 15, 1932. H. K. HITCHCOCK PLATE GLASS POLISHING APPARATUS Filed Feb. 11, 1950 -a Sheets-sheaf 2 a 'i 1/1/1/ I Patented Nov; 15,

sr rEsf PATENT oiFF cE v 1:. inroncocx, orrrr'rssunen, PENNSYLVANIA, Assreiroa tr'o PITTSBURGH:

I PLA TE GLASS COMPANY, A CORPORATION OF PENNSYLVANIA rmrn GLASS romsrrme APPARATUS A'pplication filed February 111, 1930 Serial No. 427,584.

V The invention relates to apparatus for pol-- ishing plate glass, and particularly to that form of apparatus in which the glass to be polished is carried beneath a series of polishers on .cars, tables, or other carrier apparatus. After a certain period of use, the felts of the runnersor blocks become caked with rouge or other polishing material and their .efliciency is reduced. The object of the present invention is .to provide a simple, convenient zarrangementjfor cleaning the felts without interfering with: the continuous opis a plan View of part of the structure shown in Fig. 2. Fig. tis a section taken on the line IVIV of Fig. 3. Fig. is a plan View of a modification. Fig. 6 is an end view partly in section of the structure of Fig. 5. Fig. 7

is a section on the line VII-VII of Fig. 5.

Fig. 8 is a section on the line VIIIVIII of Fig. 5. And Fig. 9 is a detail section similar to that of Fig. 2 of a modification.

Referring to Figs. 1 to 4, 1 is a track upon which a series of tables or cars 2, 2, etc. are

mounted, such tables being provided on their lower sides with a series of rack bars 3 by means of which the tables are moved continuously beneath the grinding and polishing machines. 4 is one of a series of polishing spiders carried by a spindle 5 and provided with a plurality of'polishing blocks 6, such blocks being faced with felt in the usual way. The spindle 5 is mounted for rotation in a tubular casing 6 which carries at its upper end a motor 7 such motor being 'arranged to drive the spindle 5 through suitable reduction gearing in the casings 8 and 9, this being a construction well known in the art. The tubular casing 6 is supported upon the arm 10 attached to the frameworh 11 at the point 12 and the unit is raised and lowered by means of theair cylinder 13 whose i piston 14 is pivoted to the end of the lever 10. Asecond arm 15 pivoted to the frame 11 and to -the lower end of the casing 6 guides the lower end of the casing in its up and down movements.

The tables 2, 2, etc. may be secured .together to form a continuous train in any desired manner, the bolts 16 being shown for accomplishing this function in Fig. Keys 17 lying in recesses between the abutting ends of the tables serveto hold the upper surfaces of the'table at the same level. The scraping device shown in Figs. 2,3 and 4 com-prises a transverse channel 18 mounted for vertical movement 5:111 .a recess at the ends of the tables,

such recess lyingpartly in one table and partly in the other. The channel 18is carried by a series of bolts 19 whose upper ends are sw-ivelled in the channel. ,The heads 20 of the bolts are provided :with square recesses 21. The washers 22 are secured against 1011: gitudinal movement on the bolts by means of the pins 23. The bolts may befconveniently rotatedto adjust the position'ofthe channel by means-of the wrench 24 shownin Fig. 2.

The ends of the channelare provided with shields or guards 25 (Fig. 4) which project down past the side edg'esof the tables. The channel is shown in operative or scraping position in Fig. 2, at which time its edges project above thelevel of the glass sheets 26, 26.

As the channel passes beneath the polisher 1 blocks 6,, its edges scrape over'the lower surfaces of the :telts 27 looseningthe rouge. When the'scraping channel 18'is not in serv ice, it is moved down'by means oi. the bolts 19 so that its edges lie below thlevelof the glass sheets and the space above the channel is filled with plaster of Paris, which material extends up tothe level of the upper surfaces of the glass sheets. Only a part of the tables are-provided with the recesses carrying the channels 18 andthese scraping devicesare only adjusted toopera'tive position'when the felts of the polisher blocks become caked with rougeso that acleaning operation :is necesnel bars 31, 31.

f f r 1,887,554

sary. This cleaning operation is required only at relatively long intervals.

Figs. 5 to 8 illustrate a modification in which a scraping member 28 is substituted for the member 18 of the Figs. 1 to 4 construction. The member 28 is in the form of a screen which is detachably secured to the tops of the tables intermediate two sheets of glass 29 and 30. The member 28 issecured at its ends to a'pair of c'hannel bars 31, 31 by means of which the scraper is secured detachably to the top of the table. Theattachment is accomplished by means of a pair of clamps 32, 32 lying beneath the channels, as'indicated in Fig. 1 with one leg of the angle beneath the edge 33 of the table. Bolts 3 eX- tending through the channels and clamps serve to secure the clamps in position. The pegs 35 in connection with the plaster 36 hold the side edges of the glass sheets, this being a well-known expedient in'the art. At the front and rear edges of the'scraper 28, felt strips 37 are preferably employed, such strips being secured at their ends to the chan- These strips are in the form of inclines, as indicated in Fig. 7 to relieve the felts of the'polishers from too direct impact against the scraper which might otherwise tend to injure suchfelts.

Fig. 9 illustrates another modification of the invention in which a different form of scraper is employed in the transverse recess 38 between the two tables. This scraper member is made of sheet-metal bent so as to provide the series of upwardly projecting ribs 39, the tops of such ribs coming at approximately the level of. the glass sheets. When it is not desired to use this device as a scraper, the space 38 may be 'filledup to the level of the tops of the glass sheets with plaster. The device may then be brought into service as a scraper when desired by merely scraping out the plaster and exposing the tops of the bars.

In this construction and that shown in Fig.

2, the spaces between the ends of the glass sheets and the scraper are filled with plaster which is indicated byv the reference numeral 40.

What I claim is:

1. In combinationin apparatus for polishing plate glass, a series of polishing machines each having a rotatable frame provided with a set of polishing runners, tables forming a continuous train mounted for movement beneath the runners and adapted to carry on their upper faces the sheets of glass to be polished, two of such tables having at their abutting ends a transverse recess, and a scrap ing device seated in such recess.

2. In combination in apparatus for polishing plate glass, a series 'of polishing machines each having a rotatable frame provided with-a set of polishing'runners, tables forming a continuous train mounted for movement beneath the runners and adapted 3. In combination in apparatus for polish-Q ing plate glas's,a series of polishing machines each havlng a rotatable'frame provided with continuous train mounted for movement beneath the runners and adapted to carry on their upper faces the sheets of glass tobe polished, two of'such tables having at their abutting ends a transverse recess, a scraping device seated in such recess, and means where by the scraping device may be aClJUSlJBd VGi tically so that in its upper position it engages the lower surfaces of the'polisher run-V ners and cleans them, and so that in another position it liesbelow the level of the upper surface of the glass sheets on the tables.

In testimony whereof, I have hereunto sub 9 scribed my name this 29th day of Jan, 1930. H. K. I-IITCHCOCK.

a set of polishing; runners, tables forming a iob iio bias 

